SUCCESS! 1"3/16 IS THE WINNER. Put the gasket kit in and all is well. Took it for a spin and it ran fine. Once all the oil from removal burnt off the header no more leak from there. Still have other leaks but,they don't leak on the header. I tried to install a inspection cover that I picked up but, the bolt hole around the starter side didn't line up. Oh well, keep looking I guess. Thanks for the help guys.